BedMachine Greenland v3 now available

Dataset
The new version of BedMachine Greenland is now available on NSIDC (https://nsidc.org/data/IDBMG4). BedMachine v3 now includes ocean bathymetry from single and multi beam data around the ice sheet, and the subglacial bed topography has been refined by incorporating additional ice thickness data. This dataset is the result of a collaborative effort amongst many international institutions including University of California Irvine, USA (NASA Cryospheric Sciences Program grant #NNX15AD55G, NSF’s ARCSS program grant #1504230, and the University of Bristol, UK (BPoG, NERC grant NE/M000869/1).

Data citation:
Morlighem M. et al., (2017), BedMachine v3: Complete bed topography and ocean bathymetry mapping of Greenland from multi-beam echo sounding combined with mass conservation, Geophys. Res. Lett., 44, doi:10.1002/2017GL074954. (http://onlinelibrary.wiley.com/doi/10.1002/2017GL074954/full)

Even though BedMachine v3 is a big improvement over the previous versions, there are still some regions that remain poorly constrained, and we would be more than happy to include more bathymetry data or ice thickness data in the next release. Please contact mathieu.morlighem@uci.edu if you are interested in making this dataset better by sharing your data.

As always, feedback is welcome!

Abstract
Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic Water (AW) that rapidly melts and undercuts Greenland's marine-terminating glaciers. Here, we present a new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness data through a mass conservation (MC) approach. A new 150-m horizontal resolution bed topography/bathymetric map of Greenland is constructed with seamless transitions at the ice/ocean interface, yielding major improvements over previous datasets, particularly in the marine-terminating sectors of northwest and southeast Greenland. Our map reveals the total sea level potential of the Greenland Ice Sheet is 7.42±0.05 m, which is 7 cm greater than previous estimates. Furthermore, it explains recent calving front response of numerous outlet glaciers and reveals new pathways by which AW can access glaciers with marine-based basins, thereby highlighting sectors of Greenland that are most vulnerable to future oceanic forcing.

Reference
Morlighem M. et al., (2017), BedMachine v3: Complete bed topography and ocean bathymetry mapping of Greenland from multi-beam echo sounding combined with mass conservation, Geophys. Res. Lett., 44, doi:10.1002/2017GL074954. (http://onlinelibrary.wiley.com/doi/10.1002/2017GL074954/full)